[Public WebGL] Implement extension EXT_frag_depth in WebGL

Mark Callow [email protected]
Mon Dec 3 18:15:38 PST 2012

On 2012/12/04 3:22, Florian Bösch wrote:
> On Mon, Dec 3, 2012 at 7:12 PM, Kenneth Russell <[email protected]
> <mailto:[email protected]>> wrote:
>     Slight concern that it seems to be supported on
>     very few mobile devices.
> I find that odd as well. Especially given that ES 2.0 was modelled
> after OGL 3.0 which has included that capability for nearly a decade.
> But I wouldn't be concerned about it for two reasons really:
I don't know what gave you that idea. OpenGL 3.0 was released in August
2008, OpenGL ES 2.0 in March 2007.  Clearly it is based on OpenGL 2.0.
> 1) It's coming anyway with ES 3.0 and presumably as vendors start
> supporting ES 3.0 support will go up.
> 2) I have a hard time imagining that it's actually absent in the
> hardware (after all it has been core part of any programmable hardware
> since a decade). I suspect it's just not exposed by the driver. So
> most likely vendors can provide a lot of support with a firmware update.
I don't think the vendors have any interest in keeping features
concealed. If it was in the hardware they would advertise the extension. 



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